---
title: "CVE-2025-3576\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2025-3576?format=md
keywords: index, follow
---

# CVE-2025-3576

Publication date 15 April 2025

Last updated 19 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2025-3576?format=md#impact-score)

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## Description

A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected
messages using RC4-HMAC-MD5 to be spoofed due to weaknesses in the MD5
checksum design. If RC4 is preferred over stronger encryption types, an
attacker could exploit MD5 collisions to forge message integrity codes.
This may lead to unauthorized message tampering.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2025-3576?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| krb5 | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Fixed 1.20.1-6ubuntu2.6 |
| 22.04 LTS jammy | Fixed 1.19.2-2ubuntu0.7 |
| 20.04 LTS focal | Fixed 1.17-6ubuntu4.11 |
| 18.04 LTS bionic | Fixed 1.16-2ubuntu0.4+esm5  Ubuntu Pro |
| 16.04 LTS xenial | Fixed 1.13.2+dfsg-5ubuntu2.2+esm7  Ubuntu Pro |
| 14.04 LTS trusty | Fixed 1.12+dfsg-2ubuntu5.4+esm7  Ubuntu Pro |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

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## Notes

---

### [hlibk](https://launchpad.net/~hlibk)

Vulnerability is present in the implementation of RC4. Using
stronger encryption types is preferred.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | High |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-3576)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2025-3576)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2025-3576)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2025-3576)

### Related Ubuntu Security Notices (USN)

+ [USN-7542-1](https://usn.ubuntu.com/USN-7542-1)
+ Kerberos vulnerability
+ 28 May 2025

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2025-3576>
* <https://bugzilla.redhat.com/show_bug.cgi?id=2359465>
* <https://access.redhat.com/security/cve/CVE-2025-3576>